Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Differential premolar extractions

C L Steyn1, R J du Preez, A M Harris

  • 1Department of Orthodontics, Faculty of Dentistry, University of Stellenbosch, Tygerberg, Republic of South Africa.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|December 5, 1997
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Systematic review of the effects of bisphosphonates on bone density and fracture incidence in childhood acute lymphoblastic leukaemia.

Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA·2019
Same author

'True Day Case' Laparoscopic Cholecystectomy in a High-Volume Specialist Unit and Review of Factors Contributing to Unexpected Overnight Stay.

Minimally invasive surgery·2018
Same author

Elective "True Day Case" Laparoscopic Inguinal Hernia Repair in a District General Hospital: Lessons Learned from 1000 Consecutive Cases.

Minimally invasive surgery·2018
Same author

Laparoscopic Common Bile Duct Exploration for Retrieval of Impacted Dormia Basket following Endoscopic Retrograde Cholangiopancreatography with Mechanical Failure: Case Report with Literature Review.

Case reports in surgery·2017
Same author

Recruitment of House Staff into Anesthesiology: Factors Responsible for House Staff Selecting Anesthesiology as a Career and Individual Training Program.

The journal of education in perioperative medicine : JEPM·2016
Same author

The at-risk medical student--what more can we do?

Irish medical journal·2014
Same journal

Smile frameworks defined by the patient's facial pattern: A cross-sectional study.

American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics·2026
Same journal

Evaluation of the correlation between dental arch width and dentofacial parameters using cone-beam computed tomography: A retrospective analysis.

American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics·2026
Same journal

Patient experiences with orthodontic retention and retainers: A scoping review.

American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics·2026
Same journal

We are there for you.

American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics·2026
Same journal

Considerations concerning credit cards.

American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics·2026
Same journal

Thieves of thought: Plagiarism in scientific writing.

American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics·2026
See all related articles

This study analyzed incisor retraction during orthodontic treatment with premolar extractions. Group 45 showed the most maxillary incisor retraction, while Group 44 had slightly more mandibular incisor retraction.

Area of Science:

  • Orthodontics
  • Dental Mechanics
  • Craniofacial Analysis

Background:

  • Predicting incisor retraction is crucial for successful orthodontic treatment outcomes.
  • Fixed mechanotherapy with premolar extractions is a common orthodontic approach.
  • Understanding the influence of different extraction patterns on incisor movement is essential.

Purpose of the Study:

  • To quantify expected incisor retraction during fixed mechanotherapy without extraoral anchorage.
  • To develop regression models for predicting incisor retraction based on premolar extraction patterns.
  • To compare incisor retraction across three common symmetrical premolar extraction combinations.

Main Methods:

  • Retrospective analysis of pretreatment and posttreatment records from 73 (group 44), 74 (group 55), and 59 (group 45) orthodontic cases.

Related Experiment Videos

  • All cases were treated by a single orthodontist using the edgewise technique.
  • Measurements of maxillary and mandibular incisor retraction relative to the facial plane (N-Po) were recorded.

    • Main Results:

    • Maxillary incisor retraction was similar between group 55 (4.2 mm) and group 44 (4.7 mm), but significantly greater in group 45 (6.6 mm; p < 0.05).
    • Mandibular incisors showed slightly greater retraction in group 44 compared to groups 55 and 45 (p < 0.05).
    • Developed regression models demonstrated potential utility in predicting incisor retraction.

    Conclusions:

    • The pattern of premolar extraction significantly influences the amount of incisor retraction achieved.
    • Group 45 extractions yield the most maxillary incisor retraction, while group 44 extractions result in slightly more mandibular incisor retraction.
    • The developed regression models can serve as a valuable adjunct for orthodontists in treatment planning and extraction decisions.